diff --git a/tools/test_sync_with_kernel_tree.py b/tools/test_sync_with_kernel_tree.py
index 21f8d51..1b098a9 100644
--- a/tools/test_sync_with_kernel_tree.py
+++ b/tools/test_sync_with_kernel_tree.py
@@ -138,7 +138,7 @@ def run_cli(virtual_git, command, args):
         command,
     ]
     _args.extend(args)
-    runner = CliRunner(mix_stderr=False)
+    runner = CliRunner()
     return runner.invoke(
         sync_with_kernel_tree.cli,
         _args,